1 files changed, 213 insertions, 29 deletions

diff --git a/src/util/wiki-data.js b/src/util/wiki-data.js
index b4f7f21..aba508c 100644
--- a/src/util/wiki-data.js
+++ b/src/util/wiki-data.js
@@ -1,5 +1,7 @@
 // Utility functions for interacting with wiki data.
 
+import { Album, Track } from '../data/things.js';
+
 // Generic value operations
 
 export function getKebabCase(name) {
@@ -62,32 +64,115 @@ export function chunkByProperties(array, properties) {
         }));
 }
 
-// Sorting functions
+// Sorting functions - all utils here are mutating, so make sure to initially
+// slice/filter/somehow generate a new array from input data if retaining the
+// initial sort matters! (Spoilers: If what you're doing involves any kind of
+// parallelization, it definitely matters.)
+
+// General sorting utilities! These don't do any sorting on their own but are
+// handy in the sorting functions below (or if you're making your own sort).
+
+export function compareCaseLessSensitive(a, b) {
+    // Compare two strings without considering capitalization... unless they
+    // happen to be the same that way.
+
+    const al = a.toLowerCase();
+    const bl = b.toLowerCase();
+
+    return (al === bl
+        ? a.localeCompare(b, undefined, {numeric: true})
+        : al.localeCompare(bl, undefined, {numeric: true}));
+}
+
+// Subtract common prefixes and other characters which some people don't like
+// to have considered while sorting. The words part of this is English-only for
+// now, which is totally evil.
+export function normalizeName(s) {
+    // Turn (some) ligatures into expanded variant for cleaner sorting, e.g.
+    // "ff" into "ff", in decompose mode, so that "ü" is represented as two
+    // bytes ("u" + \u0308 combining diaeresis).
+    s = s.normalize('NFKD');
 
-export function sortByName(a, b) {
-    let an = a.name.toLowerCase();
-    let bn = b.name.toLowerCase();
-    if (an.startsWith('the ')) an = an.slice(4);
-    if (bn.startsWith('the ')) bn = bn.slice(4);
-    return an < bn ? -1 : an > bn ? 1 : 0;
+    // Replace one or more whitespace of any kind in a row, as well as certain
+    // punctuation, with a single typical space, then trim the ends.
+    s = s.replace(/[\p{Separator}\p{Dash_Punctuation}\p{Connector_Punctuation}]+/gu, ' ').trim();
+
+    // Discard anything that isn't a letter, number, or space.
+    s = s.replace(/[^\p{Letter}\p{Number} ]/gu, '');
+
+    // Remove common English (only, for now) prefixes.
+    s = s.replace(/^(?:an?|the) /i, '');
+
+    return s;
+}
+
+// Component sort functions - these sort by one particular property, applying
+// unique particulars where appropriate. Usually you don't want to use these
+// directly, but if you're making a custom sort they can come in handy.
+
+// Universal method for sorting things into a predictable order, as directory
+// is taken to be unique. There are two exceptions where this function (and
+// thus any of the composite functions that start with it) *can't* be taken as
+// deterministic:
+//
+//  1) Mixed data of two different Things, as directories are only taken as
+//     unique within one given class of Things. For example, this function
+//     won't be deterministic if its array contains both <album:ithaca> and
+//     <track:ithaca>.
+//
+//  2) Duplicate directories, or multiple instances of the "same" Thing.
+//     This function doesn't differentiate between two objects of the same
+//     directory, regardless of any other properties or the overall "identity"
+//     of the object.
+//
+// These exceptions are unavoidable except for not providing that kind of data
+// in the first place, but you can still ensure the overall program output is
+// deterministic by ensuring the input is arbitrarily sorted according to some
+// other criteria - ex, although sortByDirectory itself isn't determinstic when
+// given mixed track and album data, the final output (what goes on the site)
+// will always be the same if you're doing sortByDirectory([...albumData,
+// ...trackData]), because the initial sort places albums before tracks - and
+// sortByDirectory will handle the rest, given all directories are unique
+// except when album and track directories overlap with each other.
+export function sortByDirectory(data, {
+    getDirectory = o => o.directory
+} = {}) {
+    return data.sort((a, b) => {
+        const ad = getDirectory(a);
+        const bd = getDirectory(b);
+        return compareCaseLessSensitive(ad, bd)
+    });
 }
 
-// This function was originally made to sort just al8um data, 8ut its exact
-// code works fine for sorting tracks too, so I made the varia8les and names
-// more general.
-export function sortByDate(data, dateKey = 'date') {
-    // Just to 8e clear: sort is a mutating function! I only return the array
-    // 8ecause then you don't have to define it as a separate varia8le 8efore
-    // passing it into this function.
-    return data.sort(({ [dateKey]: a }, { [dateKey]: b }) => {
+export function sortByName(data, {
+    getName = o => o.name
+} = {}) {
+    return data.sort((a, b) => {
+        const an = getName(a);
+        const bn = getName(b);
+        const ann = normalizeName(an);
+        const bnn = normalizeName(bn);
+        return (
+            compareCaseLessSensitive(ann, bnn) ||
+            compareCaseLessSensitive(an, bn));
+    });
+}
+
+export function sortByDate(data, {
+    getDate = o => o.date
+} = {}) {
+    return data.sort((a, b) => {
+        const ad = getDate(a);
+        const bd = getDate(b);
+
         // It's possible for objects with and without dates to be mixed
         // together in the same array. If that's the case, we put all items
         // without dates at the end.
-        if (a && b) {
-            return a - b;
-        } else if (a) {
+        if (ad && bd) {
+            return ad - bd;
+        } else if (ad) {
             return -1;
-        } else if (b) {
+        } else if (bd) {
             return 1;
         } else {
             // If neither of the items being compared have a date, don't move
@@ -99,9 +184,115 @@ export function sortByDate(data, dateKey = 'date') {
     });
 }
 
-// Same details as the sortByDate, 8ut for covers~
-export function sortByArtDate(data) {
-    return data.sort((a, b) => (a.coverArtDate || a.date) - (b.coverArtDate || b.date));
+export function sortByPositionInAlbum(data) {
+    return data.sort((a, b) => {
+        const aa = a.album;
+        const ba = b.album;
+
+        // Don't change the sort when the two tracks are from separate albums.
+        // This function doesn't change the order of albums or try to "merge"
+        // two separated chunks of tracks from the same album together.
+        if (aa !== ba) {
+            return 0;
+        }
+
+        // Don't change the sort when only one (or neither) item is actually
+        // a track (i.e. has an album).
+        if (!aa || !ba) {
+            return 0;
+        }
+
+        const ai = aa.tracks.indexOf(a);
+        const bi = ba.tracks.indexOf(b);
+
+        // There's no reason this two-way reference (a track's album and the
+        // album's track list) should be broken, but if for any reason it is,
+        // don't change the sort.
+        if (ai === -1 || bi === -1) {
+            return 0;
+        }
+
+        return ai - bi;
+    });
+}
+
+// Note that this function only checks constructor equality, not inheritence!
+// So it won't group subclasses together (as though they were the same type).
+export function sortByThingType(data, thingConstructors) {
+    data.sort((a, b) => {
+        const ai = thingConstructors.indexOf(a.constructor);
+        const bi = thingConstructors.indexOf(b.constructor);
+
+        if (ai >= 0 && bi >= 0) {
+            return ai - bi;
+        } else if (ai >= 0) {
+            return -1;
+        } else if (bi >= 0) {
+            return 1;
+        } else {
+            return 0;
+        }
+    });
+}
+
+// Composite sorting functions - these consider multiple properties, generally
+// always returning the same output regardless of how the input was originally
+// sorted (or left unsorted). If you're working with arbitrarily sorted inputs
+// (typically wiki data, either in full or unsorted filter), these make sure
+// what gets put on the actual website (or wherever) is deterministic. Also
+// they're just handy sorting utilities.
+//
+// Note that because these are each comprised of multiple component sorting
+// functions, they expect more than just one property to be present for full
+// sorting (listed above each function). If you're mapping thing objects to
+// another representation, try to include all of these listed properties.
+
+// Expects thing properties:
+//  * directory (or override getDirectory)
+//  * name (or override getName)
+export function sortAlphabetically(data, {getDirectory, getName} = {}) {
+    sortByDirectory(data, {getDirectory});
+    sortByName(data, {getName});
+    return data;
+}
+
+// Expects thing properties:
+//  * directory (or override getDirectory)
+//  * name (or override getName)
+//  * date (or override getDate)
+export function sortChronologically(data, {getDirectory, getName, getDate} = {}) {
+    sortAlphabetically(data, {getDirectory, getName});
+    sortByDate(data, {getDate});
+    return data;
+}
+
+// Highly contextual sort functions - these are only for very specific types
+// of Things, and have appropriately hard-coded behavior.
+
+// Sorts so that tracks from the same album are generally grouped together in
+// their original (album track list) order, while prioritizing date (by default
+// release date but can be overridden) above all else.
+//
+// This function also works for data lists which contain only tracks.
+export function sortAlbumsTracksChronologically(data, {getDate} = {}) {
+    // Sort albums before tracks...
+    sortByThingType(data, [Album, Track]);
+
+    // Group tracks by album...
+    sortByDirectory(data, {
+        getDirectory: t => (t.album ? t.album.directory : t.directory)
+    });
+
+    // Sort tracks by position in album...
+    sortByPositionInAlbum(data);
+
+    // ...and finally sort by date. If tracks from more than one album were
+    // released on the same date, they'll still be grouped together by album,
+    // and tracks within an album will retain their relative positioning (i.e.
+    // stay in the same order as part of the album's track listing).
+    sortByDate(data, {getDate});
+
+    return data;
 }
 
 // Specific data utilities
@@ -152,13 +343,6 @@ export function getArtistNumContributions(artist) {
     );
 }
 
-export function getArtistCommentary(artist, {justEverythingMan}) {
-    return justEverythingMan.filter(thing =>
-        (thing?.commentary
-            .replace(/<\/?b>/g, '')
-            .includes('<i>' + artist.name + ':</i>')));
-}
-
 export function getFlashCover(flash, {to}) {
     return to('media.flashArt', flash.directory, flash.coverArtFileExtension);
 }